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Quick Start Guide
2
5 Alarm I/O
Includes alarm signal input and output ports, and
the number of I/O ports might vary on different
devices. For details, see Table 1-2.
For more information about I/O port, see Table 1-2.
Table 1-2 Alarm information
Port Port Name Function
Alarm I/O
ALARM_OUT
Outputs alarm signal to alarm device.
When connecting to alarm device, only the ALARM_OUT port and
ALARM_OUT_GND port with the same number can be used
together.
ALARM_OUT_
GND
ALARM_IN
Receives the switch signal of external alarm source.
Connect different alarm input devices to the same
ALARM_IN_GND port.
ALARM_IN_GN
D
Connecting Alarm Input/output 1.2
Alarm input/output is available on select models.
Connect alarm input device to the alarm input end of the I/O port. See Figure 1-2. Step 1
Device collects different states of alarm input port when the input signal is idling and
grounded.

Device collects logic "1" when input signal is connecting to +3V to +5V or idling.

Device collects logic "0" when input signal is grounded.
Alarm input Figure 1-2
Connect alarm output device to the alarm output end of the I/O port. The alarm output is Step 2
open-drain output, which works in the following modes.

Mode A: Level application. Alarm outputs high and low level, and the alarm outlet is OD,
which requires external pull-up resistance (10K Ohm typical) to work. The maximum
external pull-up level is 12V, maximum port current is 300mA and the default output
signal is high level (external pull-up voltage). The default output signal switches to low
level when there is alarm output (As long as the operating current is below 300mA, the
output low level voltage is lower than 0.8V).

Mode B: Switch application. Alarm output is used to drive external circuit, the
maximum voltage is 12V and the maximum current is 300mA. If the voltage is higher
than 12V, please use an additional electric relay.